Rise Storage

I am working on my android app and i noticed something that might be an issue. Here is the scenario im working with. Use the image widget with folder option.

Say you have a folder with several images. You delete an image and reload a new one with the same name. Now what i expect is the new image to download and run. What I'm getting is the old image. I also cleared cache and still i get the old image. I also checked file sizes the original file was 1.3 MB and the new file is 178 kbWhen checking the file size while downloading i get 1.3mb and not 178 like im supposed to

I have also waited a while to be sure the server is slow to update. This is not the case. The image still stays the same 1.3mb. How long should it take the server to update the file so that when the player checks it downloads it. Thanks.